package cn.com.dashihui.pay.SQ.Kit;

import java.security.MessageDigest;

public class MD5 {
    /* 下面这些S11-S44实际上是\uFFFD \uFFFD4*4的矩阵，在原始的C实现中是\uFFFD#define  现的�?
   这里把它们实现成为static final是表示了只读，切能在同一个进程空间内的多\uFFFD
   Instance 共\uFFFD*/
    static final int S11 = 7;
    static final int S12 = 12;
    static final int S13 = 17;
    static final int S14 = 22;

    static final int S21 = 5;
    static final int S22 = 9;
    static final int S23 = 14;
    static final int S24 = 20;

    static final int S31 = 4;
    static final int S32 = 11;
    static final int S33 = 16;
    static final int S34 = 23;

    static final int S41 = 6;
    static final int S42 = 10;
    static final int S43 = 15;
    static final int S44 = 21;

    static final byte[] PADDING = {-128, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
            0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};
    /*  面的三个成员是MD5计算过程中用到的3个核心数据，在原始的C实现\uFFFD
       定义到MD5_CTX结构\uFFFD

    */
    private long[] state = new long[4];  // state (ABCD)
    private long[] count = new long[2];  // number of bits, modulo 2^64 (lsb first)
    private byte[] buffer = new byte[64]; // input buffer

    /* digestHexStr MD5的唯\uFFFD \uFFFD个公共成员，是最新一次计算结果的
    \uFFFD 16 制ASCII表示.
    */
    public String digestHexStr;

    /* digest,是最新一次计算结果的2进制内部表示，表\uFFFD128bit MD5\uFFFD.
    */
    private byte[] digest = new byte[16];

    /*
      getMD5ofStr 类MD5\uFFFD 要的公共方法，入口参数是你想要进行MD5变换的字符串
      返回的是变换完的结果，这个结果是从公共成员digestHexStr取得的．
    */
    public String getMD5ofStr(String inbuf) {
        md5Init();
        md5Update(inbuf.getBytes(), inbuf.length());
        md5Final();
        digestHexStr = "";
        for (int i = 0; i < 16; i++) {
            digestHexStr += byteHEX(digest[i]);
        }
        return digestHexStr;

    }

    // 这是MD5这个类的标准构\uFFFD 数，JavaBean要求有一个public的并且没有参数的构\uFFFD \uFFFD
    public MD5() {
        md5Init();

        return;
    }


    /* md5Init �?��初始化函数，初始化核心变量，装入标准的幻�?*/
    private void md5Init() {
        count[0] = 0L;
        count[1] = 0L;
        ///* Load magic initialization constants.

        state[0] = 0x67452301L;
        state[1] = 0xefcdab89L;
        state[2] = 0x98badcfeL;
        state[3] = 0x10325476L;

        return;
    }
    /* F, G, H ,I \uFFFD4 基本的MD5函数，在原始的MD5的C实现中，由于它们\uFFFD
     \uFFFD单的位运算，可能出于效率的\uFFFD 把它们实现成了宏，在java中，我们把它\uFFFD
  \uFFFD\uFFFD 现成了private方法，名字保持了原来C中的\uFFFD */

    private long F(long x, long y, long z) {
        return (x & y) | ((~x) & z);

    }

    private long G(long x, long y, long z) {
        return (x & z) | (y & (~z));

    }

    private long H(long x, long y, long z) {
        return x ^ y ^ z;
    }

    private long I(long x, long y, long z) {
        return y ^ (x | (~z));
    }

    /*
       FF,GG,HH II将调用F,G,H,I进行近一步变\uFFFD
       FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
       Rotation is separate from addition to prevent recomputation.
    */

    private long FF(long a, long b, long c, long d, long x, long s,
                    long ac) {
        a += F(b, c, d) + x + ac;
        a = ((int) a << s) | ((int) a >>> (32 - s));
        a += b;
        return a;
    }

    private long GG(long a, long b, long c, long d, long x, long s,
                    long ac) {
        a += G(b, c, d) + x + ac;
        a = ((int) a << s) | ((int) a >>> (32 - s));
        a += b;
        return a;
    }

    private long HH(long a, long b, long c, long d, long x, long s,
                    long ac) {
        a += H(b, c, d) + x + ac;
        a = ((int) a << s) | ((int) a >>> (32 - s));
        a += b;
        return a;
    }

    private long II(long a, long b, long c, long d, long x, long s,
                    long ac) {
        a += I(b, c, d) + x + ac;
        a = ((int) a << s) | ((int) a >>> (32 - s));
        a += b;
        return a;
    }

    /*
     md5Update MD5的主计算过程，inbuf是要变换的字节串，inputlen是长度，这个
     函数由getMD5ofStr调用，调用之前需要调用md5init，因此把它设计成private\uFFFD
    */
    private void md5Update(byte[] inbuf, int inputLen) {

        int i, index, partLen;
        byte[] block = new byte[64];
        index = (int) (count[0] >>> 3) & 0x3F;
        // /* Update number of bits */
        if ((count[0] += (inputLen << 3)) < (inputLen << 3))
            count[1]++;
        count[1] += (inputLen >>> 29);

        partLen = 64 - index;

        // Transform as many times as possible.
        if (inputLen >= partLen) {
            md5Memcpy(buffer, inbuf, index, 0, partLen);
            md5Transform(buffer);

            for (i = partLen; i + 63 < inputLen; i += 64) {

                md5Memcpy(block, inbuf, 0, i, 64);
                md5Transform(block);
            }
            index = 0;

        } else

            i = 0;

        ///* Buffer remaining input */
        md5Memcpy(buffer, inbuf, index, i, inputLen - i);

    }

    /*
      md5Final 理和填写输出结\uFFFD
    */
    private void md5Final() {
        byte[] bits = new byte[8];
        int index, padLen;

        ///* Save number of bits */
        Encode(bits, count, 8);

        ///* Pad out to 56 mod 64.
        index = (int) (count[0] >>> 3) & 0x3f;
        padLen = (index < 56) ? (56 - index) : (120 - index);
        md5Update(PADDING, padLen);

        ///* Append length (before padding) */
        md5Update(bits, 8);

        ///* Store state in digest */
        Encode(digest, state, 16);

    }

    /* md5Memcpy �?��内部使用的byte数组的块拷贝函数，从input的inpos\uFFFD 把len长度\uFFFD
\uFFFD\uFFFD \uFFFD\uFFFD \uFFFD 字节拷贝到output的outpos位置\uFFFD \uFFFD
    */

    private void md5Memcpy(byte[] output, byte[] input,
                           int outpos, int inpos, int len) {
        int i;

        for (i = 0; i < len; i++)
            output[outpos + i] = input[inpos + i];
    }

    /*
       md5Transform是MD5核心变换程序，有md5Update调用，block是分块的原始字节
    */
    private void md5Transform(byte block[]) {
        long a = state[0], b = state[1], c = state[2], d = state[3];
        long[] x = new long[16];

        Decode(x, block, 64);

        /* Round 1 */
        a = FF(a, b, c, d, x[0], S11, 0xd76aa478L); /* 1 */
        d = FF(d, a, b, c, x[1], S12, 0xe8c7b756L); /* 2 */
        c = FF(c, d, a, b, x[2], S13, 0x242070dbL); /* 3 */
        b = FF(b, c, d, a, x[3], S14, 0xc1bdceeeL); /* 4 */
        a = FF(a, b, c, d, x[4], S11, 0xf57c0fafL); /* 5 */
        d = FF(d, a, b, c, x[5], S12, 0x4787c62aL); /* 6 */
        c = FF(c, d, a, b, x[6], S13, 0xa8304613L); /* 7 */
        b = FF(b, c, d, a, x[7], S14, 0xfd469501L); /* 8 */
        a = FF(a, b, c, d, x[8], S11, 0x698098d8L); /* 9 */
        d = FF(d, a, b, c, x[9], S12, 0x8b44f7afL); /* 10 */
        c = FF(c, d, a, b, x[10], S13, 0xffff5bb1L); /* 11 */
        b = FF(b, c, d, a, x[11], S14, 0x895cd7beL); /* 12 */
        a = FF(a, b, c, d, x[12], S11, 0x6b901122L); /* 13 */
        d = FF(d, a, b, c, x[13], S12, 0xfd987193L); /* 14 */
        c = FF(c, d, a, b, x[14], S13, 0xa679438eL); /* 15 */
        b = FF(b, c, d, a, x[15], S14, 0x49b40821L); /* 16 */

        /* Round 2 */
        a = GG(a, b, c, d, x[1], S21, 0xf61e2562L); /* 17 */
        d = GG(d, a, b, c, x[6], S22, 0xc040b340L); /* 18 */
        c = GG(c, d, a, b, x[11], S23, 0x265e5a51L); /* 19 */
        b = GG(b, c, d, a, x[0], S24, 0xe9b6c7aaL); /* 20 */
        a = GG(a, b, c, d, x[5], S21, 0xd62f105dL); /* 21 */
        d = GG(d, a, b, c, x[10], S22, 0x2441453L); /* 22 */
        c = GG(c, d, a, b, x[15], S23, 0xd8a1e681L); /* 23 */
        b = GG(b, c, d, a, x[4], S24, 0xe7d3fbc8L); /* 24 */
        a = GG(a, b, c, d, x[9], S21, 0x21e1cde6L); /* 25 */
        d = GG(d, a, b, c, x[14], S22, 0xc33707d6L); /* 26 */
        c = GG(c, d, a, b, x[3], S23, 0xf4d50d87L); /* 27 */
        b = GG(b, c, d, a, x[8], S24, 0x455a14edL); /* 28 */
        a = GG(a, b, c, d, x[13], S21, 0xa9e3e905L); /* 29 */
        d = GG(d, a, b, c, x[2], S22, 0xfcefa3f8L); /* 30 */
        c = GG(c, d, a, b, x[7], S23, 0x676f02d9L); /* 31 */
        b = GG(b, c, d, a, x[12], S24, 0x8d2a4c8aL); /* 32 */

        /* Round 3 */
        a = HH(a, b, c, d, x[5], S31, 0xfffa3942L); /* 33 */
        d = HH(d, a, b, c, x[8], S32, 0x8771f681L); /* 34 */
        c = HH(c, d, a, b, x[11], S33, 0x6d9d6122L); /* 35 */
        b = HH(b, c, d, a, x[14], S34, 0xfde5380cL); /* 36 */
        a = HH(a, b, c, d, x[1], S31, 0xa4beea44L); /* 37 */
        d = HH(d, a, b, c, x[4], S32, 0x4bdecfa9L); /* 38 */
        c = HH(c, d, a, b, x[7], S33, 0xf6bb4b60L); /* 39 */
        b = HH(b, c, d, a, x[10], S34, 0xbebfbc70L); /* 40 */
        a = HH(a, b, c, d, x[13], S31, 0x289b7ec6L); /* 41 */
        d = HH(d, a, b, c, x[0], S32, 0xeaa127faL); /* 42 */
        c = HH(c, d, a, b, x[3], S33, 0xd4ef3085L); /* 43 */
        b = HH(b, c, d, a, x[6], S34, 0x4881d05L); /* 44 */
        a = HH(a, b, c, d, x[9], S31, 0xd9d4d039L); /* 45 */
        d = HH(d, a, b, c, x[12], S32, 0xe6db99e5L); /* 46 */
        c = HH(c, d, a, b, x[15], S33, 0x1fa27cf8L); /* 47 */
        b = HH(b, c, d, a, x[2], S34, 0xc4ac5665L); /* 48 */

        /* Round 4 */
        a = II(a, b, c, d, x[0], S41, 0xf4292244L); /* 49 */
        d = II(d, a, b, c, x[7], S42, 0x432aff97L); /* 50 */
        c = II(c, d, a, b, x[14], S43, 0xab9423a7L); /* 51 */
        b = II(b, c, d, a, x[5], S44, 0xfc93a039L); /* 52 */
        a = II(a, b, c, d, x[12], S41, 0x655b59c3L); /* 53 */
        d = II(d, a, b, c, x[3], S42, 0x8f0ccc92L); /* 54 */
        c = II(c, d, a, b, x[10], S43, 0xffeff47dL); /* 55 */
        b = II(b, c, d, a, x[1], S44, 0x85845dd1L); /* 56 */
        a = II(a, b, c, d, x[8], S41, 0x6fa87e4fL); /* 57 */
        d = II(d, a, b, c, x[15], S42, 0xfe2ce6e0L); /* 58 */
        c = II(c, d, a, b, x[6], S43, 0xa3014314L); /* 59 */
        b = II(b, c, d, a, x[13], S44, 0x4e0811a1L); /* 60 */
        a = II(a, b, c, d, x[4], S41, 0xf7537e82L); /* 61 */
        d = II(d, a, b, c, x[11], S42, 0xbd3af235L); /* 62 */
        c = II(c, d, a, b, x[2], S43, 0x2ad7d2bbL); /* 63 */
        b = II(b, c, d, a, x[9], S44, 0xeb86d391L); /* 64 */

        state[0] += a;
        state[1] += b;
        state[2] += c;
        state[3] += d;

    }

    /*Encode把long数组按顺序拆成byte数组，因为java的long类型\uFFFD64bit �?
      只拆\uFFFD32bit 以�?应原始C实现的用\uFFFD
    */
    private void Encode(byte[] output, long[] input, int len) {
        int i, j;

        for (i = 0, j = 0; j < len; i++, j += 4) {
            output[j] = (byte) (input[i] & 0xffL);
            output[j + 1] = (byte) ((input[i] >>> 8) & 0xffL);
            output[j + 2] = (byte) ((input[i] >>> 16) & 0xffL);
            output[j + 3] = (byte) ((input[i] >>> 24) & 0xffL);
        }
    }

    /*Decode byte数组按顺序合成成long数组，因为java的long类型\uFFFD64bit �?
      只合成低32bit，高32bit清零，以适应原始C实现的用\uFFFD
    */
    private void Decode(long[] output, byte[] input, int len) {
        int i, j;


        for (i = 0, j = 0; j < len; i++, j += 4)
            output[i] = b2iu(input[j]) |
                    (b2iu(input[j + 1]) << 8) |
                    (b2iu(input[j + 2]) << 16) |
                    (b2iu(input[j + 3]) << 24);

        return;
    }

    /*
      b2iu 我写的\uFFFD 把byte按照不\uFFFD 正负号的原则的＂升位＂程序，因为java没有unsigned运算
    */
    public static long b2iu(byte b) {
        return b < 0 ? b & 0x7F + 128 : b;
    }

    /*byteHEX()，用来把\uFFFD byte类型的数转换成十六进制的ASCII表示\uFFFD
     \uFFFD因为java中的byte的toString无法实现这一点，我们又没有C语言中的
      sprintf(outbuf,"%02X",ib)
    */
    public static String byteHEX(byte ib) {
        char[] Digit = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
                'A', 'B', 'C', 'D', 'E', 'F'};
        char [] ob = new char[2];
        ob[0] = Digit[(ib >>> 4) & 0X0F];
        ob[1] = Digit[ib & 0X0F];
        String s = new String(ob);
        return s;
    }
    
    public String getMD5Info(String s)
	{
		char hexDigits[] =
		{ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
		
		try
		{
			byte[] btInput = s.getBytes("UTF-8");
			// 获得MD5摘要算法�?MessageDigest 对象
			MessageDigest mdInst = MessageDigest.getInstance("MD5");
			// 使用指定的字节更新摘�?
			mdInst.update(btInput);
			// 获得密文
			byte[] md = mdInst.digest();
			// 把密文转换成十六进制的字符串形式
			int j = md.length;
			char str[] = new char[j * 2];
			int k = 0;
			for (int i = 0; i < j; i++)
			{
				byte byte0 = md[i];
				str[k++] = hexDigits[byte0 >>> 4 & 0xf];
				str[k++] = hexDigits[byte0 & 0xf];
			}
			return new String(str);
		}
		catch (Exception e)
		{
			e.printStackTrace();
			return null;
		}
	}

//    public static void main(String args[]) throws Exception {
//        MD5 m = new MD5();
//        if (Array.getLength(args) == 0) {   //如果没有参数，执行标准的Test Suite
//        	String abc="abc123";
//        	MessageDigest md51 = MessageDigest.getInstance("MD5");
//        	
//        	BASE64Encoder base64en = new BASE64Encoder();
//    		String passwords = base64en.encode(md51.digest(abc.getBytes("utf-8")));
//    		System.out.println("base64编码�?-------"+passwords);
//    		
//    		
//        	System.out.println("====="+MD5.MD5_SHA(abc));
//            System.out.println("MD5 Test suite:");
//            System.out.println("MD5(\"\"):" + m.getMD5ofStr(""));
//            System.out.println("MD5(\"a\"):" + m.getMD5ofStr("a"));
//            System.out.println("MD5(\"abc\"):" + m.getMD5ofStr("abc"));
//            System.out.println("MD5(\"message digest\"):" + m.getMD5ofStr("message digest"));
//            System.out.println("MD5(\"abcdefghijklmnopqrstuvwxyz\"):" +
//                    m.getMD5ofStr("abcdefghijklmnopqrstuvwxyz"));
//            System.out.println("MD5(\"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789\"):" +
//                    m.getMD5ofStr("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"));
//        } else
//            System.out.println("MD5(" + args[0] + ")=" + m.getMD5ofStr(args[0]));
//    }
    
    public final static String MD5_SHA(String s) {  
        char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',  
                'a', 'b', 'c', 'd', 'e', 'f' };  
        try {  
            byte[] strTemp = s.getBytes();  
            //如果输入“SHA”，就是实现SHA加密�? 
            MessageDigest mdTemp = MessageDigest.getInstance("MD5");   
            mdTemp.update(strTemp);  
            byte[] md = mdTemp.digest();  
            int j = md.length;  
            char str[] = new char[j * 2];  
            int k = 0;  
            for (int i = 0; i < j; i++) {  
                byte byte0 = md[i];  
                str[k++] = hexDigits[byte0 >>> 4 & 0xf];  
                str[k++] = hexDigits[byte0 & 0xf];  
            }  
            return new String(str);  
        } catch (Exception e) {  
            return null;  
        }  
    }  
    
    public static final String MD5Encoder(String s, String charset)
    {
      try {
        byte[] btInput = s.getBytes(charset);
        MessageDigest mdInst = MessageDigest.getInstance("MD5");
        mdInst.update(btInput);
        byte[] md = mdInst.digest();
        StringBuffer sb = new StringBuffer();
        for (int i = 0; i < md.length; i++) {
          int val = md[i] & 0xFF;
          if (val < 16) {
            sb.append("0");
          }
          sb.append(Integer.toHexString(val));
        }
        return sb.toString(); } catch (Exception e) {
      }
      return null;
    }
    
}

